👨‍💼 When users click "View Entry" on a journal entry, nothing happens. They need a way to trigger tool calls that fetch detailed data from the host application.

You're going to build upon the abstraction you and 🧝‍♀️ Kellie built in the last exercise so you can use it for tool calls as well:

await sendMcpMessage(
	'tool',
	{ toolName: 'analyze_rock_sample', params: { sampleId: 'mars-2024-001' } },
	{ signal: unmountSignal },
)

🧝‍♀️ Note: I added support for signal to the sendMcpMessage function so you can cancel the tool call if the component unmounts.

A component can unmount when it's removed from the page. Without canceling pending tool calls, you'll get memory leaks and potentially update state on unmounted components, causing React warnings and unexpected behavior.

I've set up useUnmountSignal for you. You need to add the 'tool' type to sendMcpMessage and wire up the actual tool call.

👨‍💼 Thanks Kellie! Let's implement this to make those journal entries interactive.